| HS Code | 843681 |
| Appearance | white powder |
| Viscosity 5wt Percent Ethanol Solution | 5-7 mPa·s |
| Butyral Content | 70.0-73.0% |
| Hydroxyl Content | 26.0-30.0% |
| Acetyl Content | <2.0% |
| Molecular Weight | 50000-70000 g/mol |
| Glass Transition Temperature | 60-65 °C |
| Density | 1.1 g/cm³ |
| Acid Value | <1 mg KOH/g |
| Volatile Content | <2.0% |
| Softening Point | 130-140 °C |
| Solubility | soluble in alcohols, ketones, esters; insoluble in water |
As an accredited B05SY Chang Chun PVB Resin factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | B05SY Chang Chun PVB Resin is supplied in 20 kg net multi-wall paper bags with inner plastic liner. |
| Container Loading (20′ FCL) | 20′ FCL loading of B05SY Chang Chun PVB Resin: palletized, moisture-protected, securely braced in dry container, ensuring safe transport. |
| Shipping | B05SY Chang Chun PVB Resin ships in sealed, moisture-proof packaging to preserve quality. Keep dry, away from direct sunlight, and store below 25°C. Ensure proper ventilation, secure loading, and avoid contact with oxidizers. Standard non-hazardous freight is acceptable, but verify local regulations for safe handling. |
| Storage | Store B05SY Chang Chun PVB Resin in a cool, dry, well-ventilated area, away from direct sunlight, heat, and ignition sources. Keep containers tightly sealed to prevent moisture absorption, which can affect resin quality. Avoid humidity and drastic temperature changes. Ensure proper labeling and good stock rotation, using oldest stock first within the recommended shelf life. |
| Shelf Life | Shelf life: 2 years when stored unopened in a cool, dry place, away from sunlight and moisture. |
In laminated safety glass interlayer production, Chang Chun PVB Resin B05SY is dry-blended with triethylene glycol di-2-ethylhexanoate or tetraethylene glycol di-n-heptanoate plasticizer at 70–78 wt% resin and 20–30 wt% plasticizer. The dry blend is fed through a loss-in-weight gravimetric feeder into a co-rotating twin-screw extruder with an L/D ratio between 34:1 and 44:1; barrel temperatures are maintained from 160 °C to 220 °C, and the melt is screened through a 100–200 mesh breaker plate before entering a coat-hanger die. Sheet thickness is calendered to 0.38 mm or 0.76 mm on a three-roll stack with roll temperatures between 40 °C and 80 °C. The cast interlayer is conditioned to a residual moisture content below 0.40 wt% because water retained above this threshold causes autoclave bubbles and haze. Production-scale line observations show that gauge variation increases when plasticizer absorption rate drifts by more than 5% between resin lots; in-line beta gauging with automatic die-bolt adjustment and edge trim recycling at 10–15 wt% regrind are used to hold sheet thickness within ±0.025 mm.
Finished interlayer properties are evaluated under ECE R43, ANSI Z26.1, GB 9656, and ISO 12543-1:2021; pummel adhesion measured per ISO 12543-4 is typically controlled between 3 and 8 units for automotive windshields. Lamination is carried out in an autoclave at 1.0–1.5 MPa pressure and 120–140 °C for 30–90 minutes, with the heating rate above 70 °C limited to prevent edge voids. The interlayer must be protected from ambient humidity above 60% RH; opened bags require pre-drying below 0.20 wt% moisture before extrusion. Terminal article types include automotive windshields, laminated side glazing, architectural laminated safety glass, and bullet-resistant laminates tested per UL 752 or EN 1063.
B05SY is dissolved at 5–10 wt% total primer solids in a solvent blend of methyl ethyl ketone, toluene, and isopropanol for single-package wash primers conforming to MIL-C-8514C and referenced in ISO 12944-5:2018 as a pre-treatment primer for atmospheric steel. The resin solution is mixed with 1–3 wt% of 85% phosphoric acid and a corrosion-inhibiting pigment dispersion under a high-shear dissolver operating at 1,500–2,500 rpm; the pigment phase is dispersed in a bead mill to a Hegman grind of 5–6 units. Hexavalent chromium-containing pigments are restricted under REACH Annex XIV; current production lines therefore substitute zinc phosphate or organosilane inhibitors, and the acid catalyst must be separated from alkaline pigment slurries until final letdown to avoid viscosity collapse. Spray application is performed at 15–25 µm dry film thickness with an air-atomized spray gun; ambient cure of 30 minutes at 20–25 °C precedes topcoat application. Terminal products include aluminum aerospace skins, architectural anodized sections, steel coil edges, and repainted rail car components tested for dry adhesion per ISO 2409:2020 cross-cut.
At addition levels of 4–12 wt% of total liquid ink mass, B05SY is pre-dissolved at 25–35 wt% solids in an ethyl acetate/ethanol or n-propyl acetate/ethanol blend under a nitrogen blanket. The binder solution is then let down with nitrocellulose or polyurethane dispersion in a bead mill; final press viscosity is adjusted to 18–22 s efflux cup #3 at 25 °C. Compliance for food-contact packaging applications is assessed under FDA 21 CFR 175.105 for adhesive components, EU Regulation 10/2011 for plastic food contact materials where the ink is part of a multilayer structure, and Swiss Ordinance SR 817.023.21 for printed food-contact films. In high-speed gravure printing at 300–400 m/min, the resin contributes pigment wetting and adhesion to corona-treated polyethylene terephthalate and biaxially oriented polypropylene; laminate bond strength is tested per ASTM F904-16 after adhesive lamination. Published data for this specific B05SY configuration in inks is limited, and formulators typically verify retained solvent by headspace gas chromatography against EU Regulation 10/2011 limits. Terminal printed products include surface-printed snack packaging, heat-sealable confectionery wrappers, shrink-sleeve partial coatings, and overprint varnishes for cartonboard.
B05SY is introduced at 1–3 wt% based on dry ceramic powder for barium titanate MLCC dielectric layers and alumina substrate green sheets. The binder is first dissolved at 10–15 wt% solids in a toluene/ethanol or methyl ethyl ketone/ethanol mixture, then blended with ceramic powder, dispersant, and plasticizer in a planetary mixer under vacuum; slurry viscosity is adjusted to 1,000–5,000 mPa·s at 25 °C with a Brookfield viscometer. Blade deairing is performed under −90 kPa absolute pressure for 20–40 minutes before casting onto a Mylar carrier at 50–200 µm wet film thickness. Binder burnout is conducted in air at 350–450 °C for 2–4 hours with a heating rate below 0.5 °C/min; residual carbon above 0.15 wt% reduces capacitance in multilayer ceramic capacitors. Published peer-reviewed data for B05SY in tape-casting is limited; the dissolution and burnout parameters are derived from general-purpose PVB binder practice and confirmed by thermogravimetric residue screening. Compliance of the final ceramic articles is assessed against RoHS Directive 2011/65/EU and relevant IEC 60384 series specifications for fixed capacitors. Terminal product types include multilayer ceramic capacitors, thick-film ceramic substrates, and low-temperature co-fired ceramic tapes.
Dry blending of B05SY with 15–25 wt% plasticizer and 0.5–2.0 wt% silane adhesion promoter precedes film casting from solution or melt to a thickness of 0.25–0.50 mm. The film is positioned between degreased glass and metal substrates, then pressed in a vacuum-bag laminator or platen press at 110–130 °C and 0.05–0.20 MPa for 20–40 minutes; vacuum-bag pressure decay is monitored to detect edge leaks and void formation. Lap shear adhesion is measured on control metal coupons per ASTM D1002-10, T-peel resistance per ASTM D1876-08, and Shore A hardness per ASTM D2240-15. When PVB content is raised to 80–85 wt%, tensile properties improve but plasticizer migration into adjacent polycarbonate or acrylic substrates must be evaluated because crazing may develop. Published peer-reviewed data for B05SY in heat-activated structural adhesive films is limited; lap shear values depend on substrate preparation and silane type rather than on resin content alone. Terminal product types include laminated architectural railings, glass-metal vision blocks, armored cab glazing, and solar collector glass-to-metal junctions tested per ISO 12543-4 or EN 1063 where applicable.
At resin loadings of 60–75 wt%, B05SY is combined with 25–40 wt% plasticizer and 0.2–0.8 wt% UV stabilizer package for photovoltaic encapsulant film extrusion. The compounded melt is processed through a single-screw or twin-screw extruder at 180–230 °C, cast to 0.38–0.76 mm, and conditioned to less than 0.30 wt% residual moisture before module lamination; moisture above that threshold produces bubbles at cell edges. Module lamination is performed in a vacuum laminator at 140–155 °C and 0.08–0.10 MPa for 10–20 minutes, with adhesion to glass and backsheet controlled by peel strength tests described in IEC 61215-1:2021. Design qualification and safety of the finished module are assessed under IEC 61215-1:2021 and IEC 61730-2:2016; North American installations may additionally require UL 1703. Terminal product types include glass-glass building-integrated photovoltaic modules, thin-film photovoltaic laminates, and solar highway noise barriers.
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Chang Chun Petrochemical Co., Ltd. supplies B05SY as a polyvinyl butyral resin produced by acid-catalyzed acetalization of polyvinyl alcohol with n-butyraldehyde. The product is positioned as a medium-viscosity PVB grade for solvent-borne coatings, ceramic and metal binders, ink vehicle systems, and glass-interlayer compounding. In its as-supplied state, B05SY is a white to off-white granular powder with a bulk density in the range 0.25–0.40 g/cm³ when determined by ISO 60 or an equivalent tapped-density procedure. The resin is packaged in moisture-barrier bags, and residual moisture at packaging is normally held below 1.0 wt% by Karl Fischer titration under ASTM E203. Moisture control is not merely a storage parameter; it directly affects dissolution rate, solution clarity, and the formation of optical defects in cast film. The grade differs from lower-viscosity PVB resins in its higher solution viscosity at equivalent solids, while it differs from high-viscosity structural grades in its faster solvent release and lower melt pressure at a given screw speed.
Publicly available B05SY datasheets are limited, and the values below are therefore compiled from the manufacturer’s B-series PVB technical literature and standard acetal-resin analytical practice. The lot certificate of analysis remains normative for any production batch. The table presents control parameters rather than an exhaustive specification.
| Property | Test method | Typical specification range |
|---|---|---|
| Appearance | Supplier visual standard | White to off-white free-flowing powder |
| Hydroxyl content expressed as PVOH | Acetylation titration, ASTM D1396 equivalent | 18.0–22.0 wt% |
| Acetate content | Saponification / gas chromatography | ≤3.0 wt% |
| Solution viscosity, 10 wt% in ethanol/toluene 95:5 at 25 °C | ISO 2555, Brookfield LV | Manufacturer-controlled band; representative value below 200 mPa·s |
| Volatile content | ISO 3251 | ≤3.0 wt% |
| Ash content | ISO 3451-1 | ≤0.5 wt% |
| Glass transition temperature, unplasticized | ISO 11357-2, DSC | 65–75 °C |
Because PVB is hygroscopic, the volatile content specification is best interpreted together with storage conditions. Dry resin stored at 23 °C and 50% RH typically remains free-flowing. Storage above 60% RH without sealed packaging leads to measurable moisture pickup and should be followed by pre-drying at 55–65 °C for 4–6 h in a desiccant dryer before melt processing.
In solvent-borne systems, B05SY is usually dissolved in short-chain alcohols, glycol ethers, or alcohol-aromatic blends. A 10 wt% solution in ethanol/toluene 95:5 compounded in a high-shear dissolver at 1500–2500 ft/min reaches visual clarity at 25–35 °C within 60–120 min. The measured Brookfield viscosity at 25 °C and 30 rpm using an LV-2 spindle under ISO 2555 is normally below 200 mPa·s; the exact value shifts with hydroxyl content and molecular weight distribution, so each batch should be normalized against a qualified reference before solvent adjustments are finalized. Closed-lid mixing or solvent reflux reduces surface evaporation and prevents gel-particle formation in the vortex zone.
The medium viscosity of B05SY provides a balance between film build and leveling. In gravure and flexographic ink vehicles, the resin is combined with adhesion promoters and nitrocellulose; the free hydroxyl groups contribute to pigment wetting and to adhesion on corona-treated polyolefin surfaces. Adhesion is commonly verified by tape pull after 24 h conditioning under ASTM D3359-17. For metal coatings, B05SY demonstrates adhesion to cold-rolled steel and aluminium when the substrate is phosphate-treated, but uncoated oxidized surfaces may require an anticorrosive primer to stabilize the interface.
For melt-compounded interlayer production, B05SY is pre-blended with plasticizer and converted on a co-rotating twin-screw extruder. Pre-drying is required when the resin has been exposed to ambient relative humidity above 60%; residual moisture above approximately 0.8 wt% produces microbubbles and optical haze in the final film. Drying is typically conducted at 55–65 °C for 4–6 h in a desiccant-bed dryer with a dew point below -40 °C. A machine configuration with L/D 36:1 to 44:1, vacuum venting at -0.08 MPa gauge, and a melt pump before the flat die provides the residence time and pressure needed to homogenize the plasticizer without generating excess shear heat. Melt temperature at the die is normally controlled at 190–210 °C. If thermocouple readings exceed 230 °C, screw speed should be reduced or barrel cooling engaged; extended residence time above this threshold promotes deacetalization and oxidative yellowing.
On production-scale lines, the observable failure modes are bubble streaking, die-lip accumulation, and increasing backpressure as degraded polyvinyl butyral adheres to the screw root. The processing window for B05SY is narrower than that of low-viscosity grades because higher molecular weight increases viscous dissipation. Screw designs with kneading blocks limited to the first third of the processing zone and forward-conveying elements after the vent reduce the risk of temperature overshoot. Published data for this specific configuration is limited; the operating limits above should be confirmed by a line-specific thermal profile.
Thermal degradation of PVB is autocatalytic and oxygen-dependent. In thermogravimetric analysis under ISO 11358-1, unplasticized B05SY may retain 90% mass up to 280–300 °C in nitrogen, but under air the onset of significant mass loss is lower. Isothermal aging at 150 °C causes progressive yellowing and reduction of residual hydroxyl functionality. For plasticized interlayer film, accelerated heat aging at 100 °C for 500 h is a useful screening condition; optical density increase measured by ASTM D1003 should be correlated with end-use requirements. Degradation liberates butyraldehyde and unsaturated chromophores, producing a characteristic odour at the die and increasing yellowness index under ASTM E313.
The melt processing boundary is therefore not defined by melting point alone. Accumulated shear heating can raise the local melt temperature above the set barrel temperature. Viscous dissipation in B05SY is significant because of its medium molecular weight. Processors using narrow-diameter screws or high-compression screw profiles may observe yellowing even when barrel temperatures remain within nominal limits. The practical control strategy is to maintain melt temperature below 220 °C, limit residence time, and use vacuum venting to strip low-molecular-weight volatiles. This constraint is more stringent than that for low-viscosity PVB grades and is a key operational boundary for B05SY.
The hydroxyl content of B05SY, expressed as PVOH, places it in the mid-adhesion category for glass and metal bonding. In laminated glass, adhesion is not a simple linear function of hydroxyl content; it is also controlled by plasticizer concentration, autoclave pressure, and the presence of surface silanol groups. PVB film produced from B05SY and plasticized with triethylene glycol bis(2-ethylhexanoate) at 35–45 phr is laminated in an autoclave at 135 °C and 1.2 MPa; glass adhesion is then evaluated by the pummel test described in ECE R43 or by impact testing under ANSI Z26.1. Higher hydroxyl content within this range improves glass adhesion but raises moisture sensitivity. Moisture absorption accelerates plasticizer migration and can produce edge clouding after damp-heat exposure at 85 °C and 85% RH for 1000 h under IEC 60068-2-78.
In coating applications, the same hydroxyl groups are the reaction sites for crosslinking. B05SY can be crosslinked with phenolic resins, melamine-formaldehyde condensates, or polyisocyanates. The crosslinking response under dynamic mechanical analysis shows an increase in storage modulus after curing; however, pot life is shortened when acid catalysts are used because the resin’s free hydroxyls promote condensation. High-humidity application should be avoided unless a moisture scavenger is incorporated. The combination of B05SY with amine-based additives requires compatibility screening because amines can compete with hydroxyl reaction sites and alter crosslink density.
B05SY differs from high-viscosity PVB grades in tensile behaviour, solution viscosity, and plasticizer uptake. In plasticized film, tensile properties are determined under ISO 527-2 or ASTM D638-14. Medium-viscosity grades such as B05SY typically produce slightly lower ultimate tensile strength and lower elongation at break than high-viscosity PVB resins when compared at the same plasticizer loading. This is a consequence of lower chain entanglement density. The practical trade-off is processability: B05SY dissolves faster, allows higher solids in coating formulations, and generates less backpressure in extrusion. For interlayer applications requiring elevated penetration resistance, high-viscosity grades or multilayer constructions are commonly selected.
Compared with low-hydroxyl PVB grades, B05SY gives stronger adhesion to silanol-bearing glass and metal surfaces but lower moisture tolerance. Compared with high-viscosity grades, it offers lower solution viscosity and easier solvent stripping but lower ultimate tensile strength in unsupported film. These differences are material-selection criteria, not quality defects. The appropriate grade depends on whether the application is limited by adhesion, moisture exposure, mechanical load, or processing throughput.
